'''Frogs''' are a diverse and largely Carnivore|carnivorous
group of short-bodied, tailless amphibian
s composing the order (biology)|order
'''Anura''' (Ancient Greek
''an-,'' without + ''oura'', tail). The Triadobatrachus|oldest fossil "proto-frog"
appeared in the early Triassic
, but molecular clock|molecular clock dating
suggests their origins may extend further back to the Permian
, 265 million years ago. Frogs are widely distributed, ranging from the tropics
regions, but the greatest concentration of species diversity
is found in tropical rainforest
s. There are approximately 4,800 recorded species, accounting for over 85% of extant amphibian species. They are also one of the five most diverse vertebrate
The body plan
of an adult frog is generally characterized by a stout body, protruding eye
s, cleft tongue
, limbs folded...